Vertically-movable folding grating



H. EDHOLM.

VERTICALLY MOVABLE FOLDING GRATING.

APPLICATION FILED JAN. 28' I820.

Patent/ed Oct. 19, 1920.

UNITED STATES HARALD EDHOLM, or UISAiA SWE-DEN.

VERT'ICALLY-MOVABLE FOLDING (ii-RATING.

Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed January 28, 1920. Serial No. 354,757.

T 0 all whom it may concern:

e it known that I, HARALD EDHoLM, a citizen of the Kingdom of Sweden, residing at Upsala, Sweden, have invented new and useful Improvements in Vertically-Movable Folding Gratings, of which the following is a specification.

In later times vertically movable folding gratings are sometimes used, especially in manufactories and works and thelike, such gratings consisting substantially of partitions pivotally interconnected by a horizontal shaft, one of said partitions being swingable about another horizontal shaft, while one end of the other partition is vertically movable in guides. The folding operation of said gratings requires relatively great power and is effected by means of a pulley or a motor, and it will easily happen that the said end movable in the guides jams therein thus causing deformation or breaking in pieces of the grating or under all circumstances disturbances in the handling thereof.

This invention relates to folding-gratings of the kind above-mentioned and its object is to provide an easy and convenient handling of the gratings by preventing the inconveniences connected with the jamming thereof.

To this purpose the invention consists chiefly in that the partition of the grat ing swingablc about the shaft carrying the grating isprovided, at the one side of the shaft, with a counter-weight balancing the grating in its totality, the other partition carrying at the one side of the shaft which connects the partitions a counter weight balancing the weight of the part of the partition positioned at the other side of the last named shaft.

A preferred embodiment of the invention is illustrated in the accompanying drawing in which- Figure 1 is a perspective, diagrammatic view of a grating embodying the invention. Figs. 2 to 4 show the grating in down position, partially raised and completelyraised position respectively.

Referring to the drawing, 1 is a door or gate frame to which the grating is applied. The grating consists of two partitions 2 and 3 constructed in the form of lattice-work and swingably interconnected by a horizontal shaft or horizontal pins 4: and 5. The partition 2 is provided with two flanges 6 and 7 secured to the same and rigidly connected with a horizontal. shaft journaled in bearings 9 and 10 attached to the gate-frame. The pins 4 and 5 are positioned about at the middle of the partition 3, one end'of which is movable up and down and provided with pins or rollers 11 and 12 adapted to slidein recesses 13 and 14: respectively made in the gate-frame 1. H At the one side of the shaft 8 the partition 2 is, at its free end, provided with a counter-weight 15 so adjusted as to balance the weight of the whole grating. At the one side of the shaft or pins 4 and 5 connecting the partition, 3 with the partition 2 the first=named partition has. a counterweight 16 adapted to balance the weight of the portion of the partition positioned at the other side of said pins. It will appear therefrom that by the arr.ngement of said counter-weights the handling of the grating may be easily effected'by the hand. The positions of the partitions and counterweights of the grating in different positions of the grating will appear from Figs. 2 to 4.

If the handlingof the grating is to be effected at any distance from the same this may beexecuted by means of the following device. Placed in the extension of the shaft 8 and coaxially therewith is a shaft 17, and secured to the same is one or more arms 18 or the like entering between the partitions 2 and3 and, if desired, so arranged as to be able to take hold of the partition 2. To

this purpose the arm 18 may be constructed as a fork, the shanks of which are placed at each side of said partition. Secured on the shaft 17 is a sprocket wheel 19 over which a chain 20 travels, and said chain 20 may be operated by means of a crank and sprocket wheel (not shown) whereby motion will be imparted by the chain 20 to the wheel 19 and shafts 17 and 8 respectively, to raise the grating.

During rotation of the shafts 17 and 8 the arm 18 willraise the partition 2." By reversing the direction of movement of the chain 20 lowering of the grating is accomplished. When occasion demands the grate may be raised or lowered by movement of the arm 21 that is fast on the shaft 17.

Having now particularly described and ascertained the nature of my said invention and in what mannerthe same is to be performed, I declare that what I claim is 1. In a vertically movable folding-grating consisting of two partitions pivotally interconnected, a horizontal shaft, forming a common axis of rotation of said partitions,

another horizontal shaft supporting the grating and the one swingable partition, 21, counter-weight connected with the lastnamed partition at the one side of the supporting shaft and adapted to assist in balancing the whole grating, and another counter-weight connected with the other partition at the one side of the first-named shaft and adapted to assist in balancing the portion of the last named partition positioned at the other side of same shaft.

2. In a vertically movable folding-grating consisting of two partitions pivotally interconnected, a horizontal shaft, forming a common aXis of rotation of said partitions, another horizontal shaft supporting the grating and the one swingable partition, a counter-weight connected with the lastnamed partition at the one side of the supporting shaft and adapted to assist in balancing the whole grating, another counterweight connected with the other partition at the one side of the first-named shaft and adapted to assist in balancing the portion of the last named partition positioned at the other side of same shaft, and means connected with the supporting shaft and adapt ed to move the swingable partition.

3. In a vertically movable folding-grating consisting of two partitions pivotally interconnected, a horizontal shaft, forming a common axis of rotation of said partitions, another horizontal shaft supporting the grating and the one swingable partition, a countenweight connected with the last named partition at the one side of the supporting shaft and adapted to assist in balancing the whole grating, another counterweight connected with the other partition at the one side of the first-named shaft and adapted to assist in balancing the portion positioned at the other side of same shaft, means connected with the supporting shaft and adapted to engage the swingablepartr tion, and a crank connected to the shaft whereby said shaft may be actuated.

In testimony whereof Ihave signed my name.

HARALD EDHOLM. 

